Eminem performs onstage during Dr. Dre and Snoop Dogg's headlining performance on the first weekend of the 2012 Coachella Valley Music and Arts Festival, Sunday, April 15, 2012, in Indio, Calif.

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Eminem brings high-wattage star power to the just-released single by alt-pop singer-songwriter Skylar Grey.

"C'Mon Let Me Ride," the colorful and quirky lead single from Grey's upcoming album "Don't Look Down," features Em dropping a guest rap and the auto-tuned refrain from Queen's 1978 song "Bicycle Race."

The accompanying video, released this afternoon on Grey's YouTube channel, was filmed during a ...